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Russian State-Supported Cyber Actors Conduct Phishing Campaign Targeting Users of Zimbra Collaboration Suite

July 21, 2026 · CISA Cybersecurity Advisories · Severity: MEDIUM

CISA warns of a Russian state-supported phishing campaign targeting users across government and private sector organizations. The attackers use socially engineered emails to deliver malware and maintain long-term access. Defenders are advised to strengthen email security and deploy multi-factor authentication.

Key Takeaways

  • Russian state-supported cyber actors conduct a phishing campaign targeting users across multiple sectors worldwide.
  • The phishing emails use social engineering tactics to deliver malware and establish persistent access to victim networks.
  • Organizations should implement email security controls multi-factor authentication and user awareness training.
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